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A056437 as a simple table

na(n)
10
20
30
40
51
63
76
852
9148
101140
112306
1230121
1348476
14478957
151762917
168601630
1720789656
18268188642
19431583572
204685759111
2115045763312
2286991023001
23190548007556
242526401808203
254873374476388
2639199367162137

[0,0,0,0,1,3,6,52,148,1140,2306,30121,48476,
 478957,1762917,8601630,20789656,268188642,
 431583572,4685759111,15045763312,86991023001,
 190548007556,2526401808203,4873374476388,
 39199367162137]